Group Velocity of the Density Waves in Galactic Disks
LONG Min1, PENG Qiu-He1,2, LUO Xin-Lian1, CHOU Chih-Kang3
1Department of Astronomy, Nanjing University, Nanjing, 210093
2Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center, Beijing University, Beijing, 100871
3Graduate Institute of Astronomy, National Central University, Chung-Li, 32054, Taiwan, China
Group Velocity of the Density Waves in Galactic Disks
LONG Min1;PENG Qiu-He1,2;LUO Xin-Lian1;CHOU Chih-Kang3
1Department of Astronomy, Nanjing University, Nanjing, 210093
2Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center, Beijing University, Beijing, 100871
3Graduate Institute of Astronomy, National Central University, Chung-Li, 32054, Taiwan, China
Abstract： This letter is emphasized on the discussion of the group velocity of disturbed galactic density waves (GDW), which is one of the two most insurmountable problems in the density waves theory. In our calculation, we find that the galactic thickness has an important effect on the GDW. The dynamic time scale of GDW in our three-dimensional model can be prominently prolonged, from 36% to 60% contrasting to that of two-dimensional galactic model. However, it is still less than the lifetime of our Galaxy, which means that it is necessary to seek some other physical mechanisms to excite and sustain the GDW.
(Characteristics and properties of the Milky Way galaxy)
引用本文:
LONG Min;PENG Qiu-He;LUO Xin-Lian;CHOU Chih-Kang. Group Velocity of the Density Waves in Galactic Disks[J]. 中国物理快报, 2000, 17(12): 929-931.
LONG Min, PENG Qiu-He, LUO Xin-Lian, CHOU Chih-Kang. Group Velocity of the Density Waves in Galactic Disks. Chin. Phys. Lett., 2000, 17(12): 929-931.
2000, Vol. 17 
